Simply 5^3/5^7 leaving your answer in index

Given

Step-by-step explanation:

When the base is same but the exponents are different, the rule is that a^m/a^n

= a^m-n

So in this case let a be 5, m be 3 and n be 7

5^3/5^7

= 5^3-7

= 5^-4

robert puts 2 in each row

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0